As noted, you should follow your institution's infection control protocol. However, it's not worth worrying about. In 40+ year history of HIV, there have only been 58 confirmed cases of occupational transmission: http://cdc.gov/hiv/workplace/healthcareworkers.html
That is only for the US, and I don't know where you are, but statistically it is unlikely to vary greatly. Also, I assume your hospital would test the patient for HIV to determine if there is any risk at all.
No,this is of no risk for HIV. HIV is only transmitted by having unprotected vaginal or anal sex or sharing IV needles. Air inactivates the virus. A needle stick is not a risk as air is involved. No risk at all.